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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfcd7f616c083965a4f2ce06c44edf72721c58a12f75c7f14cb57c8b2973fc4' 
  AND token = '5CKaYcXDpFgdj3Tlj9HmAyIfbCO9AKTRduSv7DgmDvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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