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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e50d323b1c7d1f45d5715ad22eb88828d6b76d10b04a2f4e6aded08683b0c6' 
  AND token = '0PsVv4SKpc5B5m+LjSm/6QyijBykbdWguk7mCBoFVXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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