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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253f91add16acd0a5e6360587428c93a7b58ec009dce10c8b7b70972849fce04' 
  AND token = '2wopUS1vqXnfVZ+WFSKUJdBzV8XIzzze5dtomcx7C5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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