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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49bd0de35c664730798951d0e4b3cd00555a1c40d89806a731db962890b184c3' 
  AND token = 'Jjg7UeMOn582+UmgIvWX1WdPw3bYiRbyU65XLohqu3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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