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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c1ea9b2eb923f50f9c5281804a1d6314c79027fb985f5f9aa4eb67c8c995b1' 
  AND token = 'j2j9RnO6lSyumpcjfOBs0QjcTUwPFDp/TwC5cBOh77g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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