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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2671b5ac964d52601500910d4a67a55ede79602509020fbbf8bdac188337401d' 
  AND token = 'XXqcVnda6Jczlv9dpBvgf0xKfiELJ5f0EknvExnyufE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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