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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638f21c269628a01882852ce94e5ea81daba48fd74602db03ab0b3beadaa9f64' 
  AND token = 'fMzw1XbTuLmcl6aV7FtEhGoRqC/NAJwpd4R1v25Op4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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