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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f186f3575efd3fa122cd5f55b80b323a4803a474bdac2df12e12443736499cb' 
  AND token = 'a/1XHQIxMpWVQKOInn9XsV8CwzLWDBCczG61yDk7iKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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