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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be092d7cd9448379d931922eb3ef452e7064a224e10a4a32bc49dbcea9954ceb' 
  AND token = 'd7o+1RE3srQjTUGr4QVHW88OZhN/DzYjwkTZsBnxBk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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