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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658b981786d9869ba36af9636d2cfb2b89ae141c044179abfba3b5b16f5c112a' 
  AND token = 'AC8b5YFzYE8iULiToCvmsUAHvhBxaAW5ydlKlIhZtmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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