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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94676d661cfc6bc8df4f61fb9a1322b32912b583f625c6452e8e47d33bfc6300' 
  AND token = 'QdkCE47YrS0XQfFvews3/uTwqafg2hn/6C+x92zGYzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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