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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887cef5f576df5d79a16eb4de4381fde6dcc715c041e9be0facedb8dd2ea63a6' 
  AND token = '2kSEqJOQn5+8HgpjuXpm78cjnUjLpOHNi/qikw3EgUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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