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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61ba22884070c12e76fac3d0c4d4c5aaf5aaee9017a37342e5386fd422ceb3b' 
  AND token = '1ljw4PIzAQBbf9QUnN6qA29jxBpteUgsbpK6Vi7LUYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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