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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec533e5a5eab8d932dccb316364e7c8946b506dfbe783a10e9469a786f0a8ca' 
  AND token = 'fTthOCWf0g+sjbULTdUGXXkr7or1xNcw+T2Kl/OZj6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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