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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c700991d81f67a777039e96c37e6c1ecc44624aa48643bd6c0decbe14c82c46' 
  AND token = '3lwqQBEgWbq+4E/IPNMsGZfGuVhZNJ3UPdC59goV9sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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