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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc6a8ab9f28442533879e1ed10e1a52755b673b96204023700cb5497142dce4' 
  AND token = 'bqNnC1jqmE7cQfAV9EEFJP7QiozvrqrforFgU/oIMWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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