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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fea56009e33047c60814d3585398662fcc8c60aa60c25d53e830e19c795ab91' 
  AND token = 'Ztact0R6XzUOJtkvTZMOuJDmgQ5DWtrWYiK7hiS+o7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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