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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73fbd8f015a6da29a890b13bc27dd8a18ed1be2ad9bb214363c0fab316f1f8d' 
  AND token = 'maV+WqleAPZzR8GHk+kkt/C4hus75N/TgNwGYfdCysM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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