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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f115cf9a9739ab566c1516e7dc0ff0ffe40f8520af319a763a0c13966bfe3da' 
  AND token = 'Jq4Oj9UTTAJfENwhderGf+tH68l5QTLzvBbdNnPhNZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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