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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5b9ff43c3aab994debbacf6a39fcc2bb78a1d1cb063eafa8b65f4f076f8353' 
  AND token = 'NxhLTsl2moMP/41sxzgHYu3OBH9J3yQGxD+M0mjt5hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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