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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a23de2c03cd4409bb42713422075e9b1c6401d407eb42863aa1521aef6adb1d' 
  AND token = 'YsdjhMwB4jDnxBN+vCD1EhPLKt4dX1eN6quusNrxsCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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