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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662e3f80f8eb7ea974c8f4b43ce85447f24e0c2e84ad683c9a79fad18a5d795b' 
  AND token = 'y3G6S152DjsTuGmpLFudtwRmZxNjiwVOkzzMQgW8o1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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