SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb5e31187a163918a9387d682352f2b658d441b20ab477e59f2453a572c76c0' 
  AND token = 'wWjPDgbWmXWTdvzgRGP8nQJSLdu8So3/7gAhQg9C81w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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