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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38641011cc5106d7b24d6ebdca33794dda6477ef24e825ea37d109115d6cc293' 
  AND token = '8ofIRuLIBl147KVG+SUH8dcxKmpABt8iSgO6u81a8Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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