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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa3ac2de283cfbb9e9e177be9eb9ceffc61168ca790b3bef35d2c49e9283291' 
  AND token = 'YCOCEn7VvOePa8KqJKeHoEqvT6MJoemyAZQtDdzV1do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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