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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6b5ab83cc3ddeb8665f839da3c54f9568ffb020888358fb296965022163848' 
  AND token = 'fZEGzO/HaQJYPAUGzOPevvnR/5t1cOhyp9B26sX/ARg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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