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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b52a56b2c69626950945e9de70a0d6e43a1bb87bdd4497d500f6e35fd3e7c23' 
  AND token = '2D8UIcGvfdTtdonyY4J23O9td5ok7QqvT4y9dEPgn58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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