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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0be744a3fda8ea541088df9512ad38f7cd9ccf63d4ea5ac73b12e7a3220720' 
  AND token = '8eSb1hntQZ6QujRkAPkO5WRkLl2Tg/Yad/F9gJt7Kzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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