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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9913e4b7e7066c2764b1093b9f2fddc28224b962956335f3f39003425a3e4698' 
  AND token = 'l9vaJnY4+Tldbirg4pBbEJk2n0uTimwrM8V6W0m3iYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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