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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be94837d1c7a067b5228e44227aee566f25751aae1e6d09b5dd5e7ca2d5e548' 
  AND token = 'xd2eT/Gj+VGv9aYT1Kfc9cQK6SoeM/zYnePo02SQRbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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