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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557b0dbd5b7d2c36a1c12789f8efd6538370511cb57cac05bc6932e5c878078c' 
  AND token = 'WNR+RHTR3KIO2E0sctSJno+QUXs1QHQu4is1wKagKes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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