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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be290fa0070ee259dc5524e5727971e8e092fba5c2929bac3f833767dc89fd0c' 
  AND token = 'uoxc9qIODA65uv2fbp9AFBmWgC5aCMEMbFGUqXDGr/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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