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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24608d9fe0cf9c1a98370184b182fc93780594c56c38f5719479486e7d6e1473' 
  AND token = '9/GSwTqKux8xIG8MYc3OIpPh21Y6tEiuz7if+RdETeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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