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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf35101e78ecc6c45a48b5a70f4f51715c7b69f600e0a444b0e1860a5b70daa2' 
  AND token = '1aWM7pN4Mg2JJdY6buUEfcMxiFO+E4E27op3eOcMFLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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