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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b232855f2e67f5ece4b5f08a7521bae9ab33914d27e313055379ff4de14c9a54' 
  AND token = 'jtfybyy8Z9DoRKz0s6OI/6J315CAiGVA5KRMLK0WnlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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