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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13b98a8ba1501c56776d6354d99f84534befd9d69eb79293f297aab98c93f03' 
  AND token = 'OvvEQ2iWlqd2nrvr8y4Wg0WsdUr7eeM/ciQbZXBpbvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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