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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55ef7b17b2970c868fc3eabcd304a6e37386da98ec01b9cc1f4e299dcf5fc76' 
  AND token = 'domz7ouPYi54N3JxNqmfRUhZZpZfDOOAWfiq8P9G2Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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