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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4400307a9f6a722c1bd9a3b4f1f120ac51751019b92aa7592c07e4376cb106e' 
  AND token = 'ltgWn4EWRqcpcRrji+LAEU8J8dwW81D9Cbu7TwgtmKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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