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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbc5168c3aa750b29ff2730d654e858ab51f562153b948b450f55ba2983d396' 
  AND token = '5Ydq6nBZnFN7X6i4QQGTfL6B7/itbdTgHhOZ3rzp0GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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