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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd719e5b7f3e6d924d258435c99847d3f779875dd8a9a27af808ef12342d5af' 
  AND token = 'sZBQhhHDC9xAjwI7AW2kbVwtam0n1geT+59pXf23a7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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