SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeccf3e25f3514d35471ab57eabef1a07397d906b7e8aac8f22c1616479bd40a' 
  AND token = 'K/qHGtiuS926Lk/+TzI0Lnm3RQOwtqVFPG6/WMNXfN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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