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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8571affc006a4a8483552c0914b74ced8503adb12e7c90bfbe8ef4e3844d1e4' 
  AND token = 'aXbtZxiapBY9owwCBMMNHY/+CZ/ZegWotW32uTdPkxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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