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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd0fea52d0183541d85a5a8618f1e47625adf489e7b22480dd0e6ee41183e47' 
  AND token = '4YFqEavJWvUIxVzIxTtvYDNdKcBf5nHrKQMZhKbNVm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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