SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf801d9d634131887df608429f6051ecdeb55d86e4dd0cf707c46f8003d7a9e' 
  AND token = 'nMVwKNMRGK4mwu/zh9WMB8vDYKgOH8UKkpZrDcCYDR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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