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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feccdf8b73a37a34165b163ba36137f5e8e5e3d1b7fdfea6c0680867f697e6a5' 
  AND token = 'QoHOPFbHBHRnNp4znGFlR7mQr3igcJyQ5108QEptNw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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