SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dba12b936567973528f34e1482f5d406f5f0d13bccf441c6a8431d31b87267' 
  AND token = '7R/3H12x1jngtP+Wl5c6ubkUyIGvhHBLKPEAsMomClU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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