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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909605dd2be10abeeb2b767896bfa7ad53c957f2219add3b9cbe2b5b9390ea29' 
  AND token = 'KUNE1McA/x0SOLpy4h4rPGnqj073Pi4gZW0Z6JSRuRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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