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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9160310dddee5e4537087ca020336fe7ff9221f6c653e2835c08376e8b152c12' 
  AND token = '1OGCd28lMwSXcODkIfiyqoaWgbWEJiftPQB65lgFyGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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