SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aed8f5a2987a5671011637f3acb09edde1b2e37651a4f73b197722cc9977324' 
  AND token = '0GzRE1FjmdoeBRkGZQJRg1QGuWVmvfptEwbb/V6j3CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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