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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0953f82e7b7e9b6180f280c4144f31cf0832e83c224cb73208664af7edabfd' 
  AND token = 'D92Rbor+p7yRBNg+Dj6/CekaXpl7J69Er0evhsfj4Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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