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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28a7ebd930432d0ce24c9e68c36266019c65daa1c19110fdf34a143a39201a4' 
  AND token = 'esQHUKWdf4Z0GigI8s4yQM/Xh1iHQOIGnZVJhd1eMSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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