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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dad348de6c1e5175499645b29b9099b9687b28e89c0c24ada4572a3d879f1e6' 
  AND token = 'jw+Wgg2t+YZ36gwE5WhlnA5eiHWNzdbpt4kM66aciVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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