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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa985fd83a16b38e39530e8df5200210b6261e6a2a030ad4639a4d532664779' 
  AND token = '2ddxhExXHs+IcvkGoL/hOGAPt0J65r8tA19XfDFkX7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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