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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10be7d4f54a323db2286d60da19cb38d835fa8c8b17d1152ac26b23018f09dce' 
  AND token = 'hkcHyRmQtDFTrR0Z8CJcQRTpXEVUJHx3iEh1R5kg+2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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