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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d531aa97fcee36765de140a51f8a9afa1fad11ae420ae8a49a75e1f9b6614f' 
  AND token = '7serE2aNHaqpDfTNbZu2ynqpa7E2qxqQBtXQ2eXi9Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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