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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fa0e7a20f653627caa7478f6d2152de9f201e0c117ba6dec96ae8eaeb77822' 
  AND token = '5SlQoOvclfe4wob5fMnk1wPBB8NItjFZGPUoxkaODs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}