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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ac7ca8c5598502e97945a826e0d5a5cb5b90625cbcd47fd182a9e3fb8f475c' 
  AND token = 'CHuY73WkI0ZrEiVFkPtQS7YPGKs2frKmOGot02IZ7eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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