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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83228dd1469c99fe396aff08489248538caa5f3dd6f5bd1f7ca5799cb5a565c' 
  AND token = 'jSp/BV5Y0sSdc9cNiTqP0Mmc9FCTjqeMcVWKVe/exvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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