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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26bb7900ef5171b5b2be63fbd2d653fa76f9c05ebab5e6a45ab190e96416684' 
  AND token = 'obhUfscpJazOmcUXgM/p80ep55U7YtcIKPZ8Cnhfg2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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