SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479f60540e9e7fb332d3aa1efbeaf9d7e91d70da88be30186b0b596bd4b0355c' 
  AND token = 'Ygq+tKHupkNBDGvS+vCYuvMLbm+wl5+vm6yZ8ChzwPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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