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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719d1b1870acb2f789ac2528725054e48dd9edf2bfb1af713453234f3b38fd05' 
  AND token = 'E9K0LAuPDV5iyPwS39DiUYRuBH8QhQ+EsuRRw33/nic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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