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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3624c565231b13766adad0fa6d69a585ec063dd559211fe45e42e1e44d0a4b' 
  AND token = '2KPyAHvixBsIxddFU58bVb/g9qfphogNtHR8ud5cJeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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